<@U0MDNAU02> try not to use `out`, it helps with s...

# announcements

[semoro]

@tyrondis try not to use out, it helps with stdlib array. Like so

fun <T> kotlin.Array<kotlin.Array<T>>.flatten(): Array<T> {
        val result = Array<T>(sumBy { it.size })
        for (array in this) {
            for (element in array) {
                result.add(element)
            }
        }
        return result
    }